code: def test_string_response(self):
      response = self.df.chat("Name the costliest gin")
      self.assertTrue(
          response.find("Robert Burnett\nOld Tom Gin Bot.1940s.") != -1
      )
  
file_path: pandas-ai/integration/test_gin.py
imports: import os
  import unittest
  from pandasai import SmartDataframe
  from pandasai.llm import OpenAI
label_desc: Use image node_id 4 for calling the TestGin obj's underlying member method code with example usage: obj.test_string_response() without return types